You are totally not pregnant. [M4a]

You cannot possibly be pregnant. [M4a]

And yet here you are, tummy distended, filled with pressure and movement and discomfort and ... arousal?

Tell me what's growing inside you. Eggs? Larvae? Tentacles? Fungus? A demon's child? Alien spawn?

And why were you so sure you couldn't be knocked up? Let's lean into horror/sci fi elements here.

20+ and reasonably literate, please. All genders welcome.